Free Downloads

 Created for Intermediate Technology Development Group (ITDG), as part of an overseas aid project for DfID.

SMALL WIND SYSTEMS FOR BATTERY CHARGING.

There are 3 booklets available as downloads.

more about the guide for development workers:
Background:
This booklet outlines the potential for using small wind generators to charge batteries • typically
motorcycle, car or lorry batteries• for use in households where mains electricity has not yet
reached. In many countries of the world this is the case for the majority of the population, and in
some rural areas almost all the population.
The background to this booklet is a UK Government-funded project entitled "Small Wind Systems
for Battery Charging" that was undertaken in Peru, Sri Lanka and the UK. The project
demonstrated the potential market for small wind energy systems and the economic and technical
viability of locally manufactured, low-cost small wind battery charging units, suitable for use in
remote areas of developing countries. This booklet is one published output of the project. There
are also technical manuals for generator manufacturers, blade manufacturers and installers. Most
of the practical information explained in this booklet is taken from pilot installations in Peru and Sri
Lanka.
This research on small wind energy systems for battery charging is the result of a collaborative
effort involving numerous contributors.
The project was managed by ITDG (also known as the Intermediate Technology Development
Group) under a contract to the UK Department for International Development.
The overall international project was co-ordinated by Dr Smail Khennas, Senior Energy
Specialist from ITDG with support from Simon Dunnett. The field work in Peru and Sri Lanka was
respectively managed by Teodoro Sanchez and Rohan Senerath, with support from Sunith
Fernando.
Simon Dunnett, Dr Smail Khennas and Hugh Piggott (a UK technical consultant for the project),
are the authors of this guide for development workers considering the use of small wind energy
systems in rural households
The views expressed in this report are those of the authors and do not necessarily represent the
views of the sponsoring organisations, the reviewers or the other contributors.

more about the blade booklet
Wind rotor blade construction
Small Wind Systems for Battery Charging
CONTENTS
1. Introduction........................................................................................................4
The wind generator 4
Steps in the wind rotor construction procedure 4
The two rotor designs 5
The shapes of the blades 7
2. Templates, Patterns and Moulds .........................................................................8
Templates 8
Patterns 8
Making two separate patterns 9
Finishing of the surface. 1 0
An alternative idea : making patterns from metal 1 0
Making the moulds 1 1
3. Blade construction............................................................................................1 3
The procedure in Peru is as follows. 1 3
4. Testing for strength.........................................................................................1 5
5. Balancing and mounting.....................................................................................1 6
Balancing the rotor 1 6
Mounting the rotor blades 1 7
Appendix I :Blade design details .............................................................................1 8
Sri Lanka K2 blade design by Sunith Fernando 1 8
Peru NACA4412 blade designed by Teodoro Sanchez 1 8